powersome

From power +‎ -some.

powersome (comparative more powersome, superlative most powersome)

1. (dialect) Characterised or marked by power; powerful.
   • 1886, Sir Thomas Dick Lauder, The Wolfe of Badenoch: A Historical Romance of the Fourteenth Century:

     "Uch ay," said MacErchar, "they be's powersome brutes— powersome brutes, in troth, and plaguy cunning..

   • 2000, Tabor Evans, Longarm 257: Longarm and the Nevada Bellydancer:

     So he moseyed over by the tracks to light up and loiter in the darker shadows of the water tower as a million years went by and then at last he spied the headlamp of a powersome Baldwin 4-6-2 puffing, thirsty, up from the southwest.

   • 2014, John Brunner, Children of the Thunder:

     “Gun, yes! But he is rich and powersome, and was our mayor. […] ”